KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > nextapp > echo2 > webrender > ServiceRegistry


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.webrender;
31
32 import java.util.HashMap JavaDoc;
33 import java.util.Map JavaDoc;
34
35 /**
36  * A registry of <code>Service</code> objects that may be recalled based
37  * on <code>Id</code> values.
38  */
39 public class ServiceRegistry {
40
41     /** Maps service Ids to services */
42     private final Map JavaDoc serviceMap = new HashMap JavaDoc();
43     
44     /**
45      * Creates a new <code>ServiceRegistry</code>.
46      */
47     public ServiceRegistry() {
48         super();
49     }
50     
51     /**
52      * Adds a service to the registry.
53      *
54      * @param service The service to be added.
55      */
56     public synchronized void add(Service service) {
57         if (serviceMap.containsKey(service.getId()) && serviceMap.get(service.getId()) != service) {
58             throw new IllegalArgumentException JavaDoc("Identifier already in use by another service.");
59         }
60         serviceMap.put(service.getId(), service);
61     }
62     
63     /**
64      * Returns the service with the specified <code>Id</code>.
65      *
66      * @param id The <code>Id</code> of the service to be retrieved.
67      * @return The service which is identified by <code>id</code>.
68      */
69     public Service get(String JavaDoc id) {
70         return (Service) serviceMap.get(id);
71     }
72     
73     /**
74      * Removes a service from the registry.
75      *
76      * @param service The service to be removed.
77      */
78     public synchronized void remove(Service service) {
79         serviceMap.remove(service.getId());
80     }
81 }
82
Popular Tags